In the US most people in suburbs only ever walk from their door to their car (which is itself often inside the garage) and then they sit in their steel and glass box to the minimal possible distance from their desk, then do the reverse on the way home.
Idk. I live in a suburb and my little neighborhood is pretty friendly to the point where someone can post to our private Facebook group and ask someone to hold a package or to check out their house while they're on vacation. Really depends on what kind of community you have
What I'm describing is unrelated to friendliness. Our built environment is the number one determinant of encounters with our neighbors. You can be perfectly friendly with people who you rarely see and could never make a routine of greeting (because you rarely see them without prior planning).
Not usually, or if they do, they're merely 'decorative' in that they're not a viable option for pedestrians to get from A to B. They just end without signals or crosswalks. Someone in a wheelchair would literally have to drive in the street in many areas of the south.
I have not seen of a single new development in the US without sidewalks in the last 20 years+. It must be the law in 99% of cities to build a sidewalk anytime a property is developed.
